Door for ore-roasting furnaces.



No. 688,587. Patented Dec. l0, [90L J. P. BRIDGEWATER.

DOOR FOR DRE RUASTING FURNACES.

'(Application filed Aug. 13, 1901.)

(No Model.)

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UNITED STATES PATENT OFFICE.

JOHN P. BRIDGEWATER, OF EVERETT, WASHINGTON.

DOOR FOR ORE-ROASTING FURNACES.

SPECIFICATION forming part of Letters Patent No. 688,587, dated December10, 1901. Application filed August 13, 1901. Serial No. 71,928. (Nomodel.)

T0 aIZZ whom it may concern:

Be it known that I, JOHN P. BRIDGEWATER, a citizen of the United Statesof America, residing at Everett, in the county of Snohomish and State ofWashington, have invented a new and usefullmprovement in Doors for Ore-Roasting Furnaces, of which the following is a specification, referencebeing had to the accompanying drawings, in which- Figure 1 is a sideelevation of a portion of a calcining-furnace provided with my improvedgravitating doors; and Fig. 2 a trans verse section of the same, takenon the line 2 2.

The object of this invention is to provide simple devices forautomatically closing the slot at the side of the furnace through whichthe stirrer-shaft works, as more fully hereinafter set forth.

The rabble or stirrer-shaft a in the wellknown Wethey furnace (seePatent No. 640,058, dated December 26, 1899, to A. H. WVethey) worksthrough a horizontal slot in the side of the furnace while the stirreror rabble is being operated, and it is desirable to employ devices fornormally closing this slot, but which at the same time will permit therabble or stirrer arm to work freely along the slot. To accomplish this,I employ a series of plates 19, which are hung upon pins 0, projectingoutwardly from the side of the furnace just above the slot. Preferablyeach plate is hung upon two pins 0, projecting from the furnace abovethe slot, and the adjacent ends of the plates overlap to a sufficientextent to break the joints between the plates and entirely close theslot. The plates hang loosely on the pins, and normally their loweredges lie below the slot in a channel in the bottom iron of the slot.the pins 6 pass through it is slotted vertically, as at (1, so as topermit the plate to freely rise and fall, and the plate is preventedfrom con1- ing off the pins by suitable keys einserted in their ends.Each end of each plate is beveled downwardly and inwardly, as at f,these beveled edges inclining toward each other, giving to the plate atrapezoidal shape.

It will be observed that as the stirrer-shaft passes along the slot itwill strike against the inclined edges and automatically raise theplates one after another, each plate dropping back into place after thearm or shaft passes Each plate where i it. It will be observed that themovement of the plates will be easy and noiseless and that but a smallarea of the slot will be uncovered at any one time. It will be observedthat by beveling both the forward edge and the rear edge of each platethe plates will not only be raised easily and noiselessly, but will alsofall back into place with a minimum of noise and wear.

Having thus fully described my invention, what I claim, and desire toobtain by Letters Patent, is-

1. The combination with a calcining-furnace having a slot in its sideWall and a series of pins projecting from said wall above said slot, ofa series of plates supported on said pins and having a vertical bodilymovement thereon and normally closing said slot, the adjacent ends ofsaid plates being overlapped and the lower forward edge of each platebeing beveled upward.

2. The combination with a calcining-furnace having a slot inits sidewall, of a series of plates supported on said wall and having a freebodily vertical movement, the adjacent ends of said plates beingoverlapped and the lower forward edge of each plate beveled upward.

3. The combination with a calcining-fun nace having a slot in its sidewall, of a series of plates supported on said wall-and normally closingsaid slot, and means whereby said plates are permitted a bodily verticalmovement, the adjacent end of said plates being overlapped and theforward and rear lower edge of each plate being inclined upward.

4. The combination with a calcining-furnace, having a slot in its sidewall and a se ries of pins projecting from said wall above said slot, ofa series of plates hung loosely on said pins and slotted so as to havefree bodily vertical movement thereon, the adjacent ends of said platesbeing overlapped and their forward and rear lower edges being inclinedupward away from each other.

In testimony whereof I hereunto affix my signature, in the presence oftwo witnesses, this 6th day of August, 1901.

JOHN P. BRIDGEWATER.

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